<?php
/**
 * 不太旧的smtp
 * @author Jason
 *
 */
class Smtp
{

	function smtp ($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass)

	{
		$this->debug = FALSE;

		$this->smtp_port = $smtp_port;

		$this->relay_host = $relay_host;

		$this->time_out = 60; // is used in fsockopen()

		$this->auth = $auth; // auth

		$this->user = $user;

		$this->pass = $pass;

		$this->host_name = "localhost"; // is used in HELO command
		$this->log_file = "";

		$this->sock = FALSE;
	}

	/* Main Function */
	function sendmail ($to, $from, $subject = "", $body = "", $mailtype,
			$returnpath = "", $cc = "", $bcc = "", $additional_headers = "")

	{
		$mail_from = $this->get_address($this->strip_comment($from));

		$body = \preg_replace("/(^|(\r\n))(\.)/", "\1.\3", $body);

		$header = "";
		if (isset($returnpath) && $returnpath != "") {
			$header .= "Reply-To:" . $returnpath . "\r\n";
		}

		$header .= "MIME-Version:1.0\r\n";

		if ($mailtype == "HTML") {

			$header .= 'Content-Type:text/html; charset=utf-8' . "\r\n";
		}

		$header .= "To: " . $to . "\r\n";

		if ($cc != "") {

			$header .= "Cc: " . $cc . "\r\n";
		}

		$header .= "From: $from<" . $from . ">\r\n";

		$header .= "Subject: " . $subject . "\r\n";

		$header .= $additional_headers;

		$header .= "Date: " . date("r") . "\r\n";

		$header .= "X-Mailer:By Redhat (PHP/" . phpversion() . ")\r\n";

		list ($msec, $sec) = explode(" ", microtime());

		$header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec *
				1000000) . "." . $mail_from . ">\r\n";

				$TO = explode(",", $this->strip_comment($to));

				if ($cc != "") {

					$TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
				}

				if ($bcc != "") {

					$TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
				}

				$sent = TRUE;

				foreach ($TO as $rcpt_to) {

					$rcpt_to = $this->get_address($rcpt_to);

					if (! $this->smtp_sockopen($rcpt_to)) {

						$this->log_write("Error: Cannot send email to " . $rcpt_to .
								"\n");

						$sent = FALSE;

						continue;
					}

					if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to,
							$header, $body)) {

								$this->log_write("E-mail has been sent to <" . $rcpt_to . ">\n");
							} else {

								$this->log_write("Error: Cannot send email to <" . $rcpt_to .
										">\n");

								$sent = FALSE;
							}

							fclose($this->sock);

							$this->log_write("Disconnected from remote host\n");
				}

				return $sent;
	}

	/* Private Functions */
	function smtp_send ($helo, $from, $to, $header, $body = "")

	{
		if (! $this->smtp_putcmd("HELO", $helo)) {

			return $this->smtp_error("sending HELO command");
		}

		// auth

		if ($this->auth) {

			if (! $this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {

				return $this->smtp_error("sending HELO command");
			}

			if (! $this->smtp_putcmd("", base64_encode($this->pass))) {

				return $this->smtp_error("sending HELO command");
			}
		}

		//

		if (! $this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {

			return $this->smtp_error("sending MAIL FROM command");
		}

		if (! $this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {

			return $this->smtp_error("sending RCPT TO command");
		}

		if (! $this->smtp_putcmd("DATA")) {

			return $this->smtp_error("sending DATA command");
		}

		if (! $this->smtp_message($header, $body)) {

			return $this->smtp_error("sending message");
		}

		if (! $this->smtp_eom()) {

			return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
		}

		if (! $this->smtp_putcmd("QUIT")) {

			return $this->smtp_error("sending QUIT command");
		}

		return TRUE;
	}

	function smtp_sockopen ($address)

	{
		if ($this->relay_host == "") {

			return $this->smtp_sockopen_mx($address);
		} else {

			return $this->smtp_sockopen_relay();
		}
	}

	function smtp_sockopen_relay ()

	{
		$this->log_write(
				"Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");

		$this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno,
				$errstr, $this->time_out);

		if (! ($this->sock && $this->smtp_ok())) {

			$this->log_write(
					"Error: Cannot connenct to relay host " . $this->relay_host .
					"\n");

			$this->log_write("Error: " . $errstr . " (" . $errno . ")\n");

			return FALSE;
		}

		$this->log_write("Connected to relay host " . $this->relay_host . "\n");

		return TRUE;
	}

	function smtp_sockopen_mx ($address)

	{
		$domain = \preg_replace("/^.+@([^@]+)$/", "\1", $address);

		if (! @getmxrr($domain, $MXHOSTS)) {

			$this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");

			return FALSE;
		}

		foreach ($MXHOSTS as $host) {

			$this->log_write("Trying to " . $host . ":" . $this->smtp_port .
					"\n");

			$this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr,
					$this->time_out);

			if (! ($this->sock && $this->smtp_ok())) {

				$this->log_write(
						"Warning: Cannot connect to mx host " . $host . "\n");

				$this->log_write("Error: " . $errstr . " (" . $errno . ")\n");

				continue;
			}

			$this->log_write("Connected to mx host " . $host . "\n");

			return TRUE;
		}

		$this->log_write(
				"Error: Cannot connect to any mx hosts (" .
				implode(", ", $MXHOSTS) . ")\n");

		return FALSE;
	}

	function smtp_message ($header, $body)

	{
		fputs($this->sock, $header . "\r\n" . $body);

		$this->smtp_debug(
				"> " .
				str_replace("\r\n", "\n" . "> ",
						$header . "\n> " . $body . "\n> "));

		return TRUE;
	}

	function smtp_eom ()

	{
		fputs($this->sock, "\r\n.\r\n");

		$this->smtp_debug(". [EOM]\n");

		return $this->smtp_ok();
	}

	function smtp_ok ()

	{
		$response = str_replace("\r\n", "", fgets($this->sock, 512));

		$this->smtp_debug($response . "\n");

		if (! \preg_match("/^[23]/", $response)) {

			fputs($this->sock, "QUIT\r\n");

			fgets($this->sock, 512);

			$this->log_write("Error: Remote host returned \"" . $response .
					"\"\n");

			return FALSE;
		}

		return TRUE;
	}

	function smtp_putcmd ($cmd, $arg = "")

	{
		if ($arg != "") {

			if ($cmd == "")
				$cmd = $arg;

				else
					$cmd = $cmd . " " . $arg;
		}

		fputs($this->sock, $cmd . "\r\n");

		$this->smtp_debug("> " . $cmd . "\n");

		return $this->smtp_ok();
	}

	function smtp_error ($string)

	{
		$this->log_write("Error: Error occurred while " . $string . ".\n");

		return FALSE;
	}

	function log_write ($message)

	{
		$this->smtp_debug($message);

		if ($this->log_file == "") {

			return TRUE;
		}

		$message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() .
		"]: " . $message;

		if (! @file_exists($this->log_file) ||
				! ($fp = @fopen($this->log_file, "a"))) {

					$this->smtp_debug(
							"Warning: Cannot open log file \"" . $this->log_file . "\"\n");

					return FALSE;
					;
				}

				flock($fp, LOCK_EX);

				fputs($fp, $message);

				fclose($fp);

				return TRUE;
	}

	function strip_comment ($address)

	{
		$comment = "/\([^()]*\)/";

		while (\preg_match($comment, $address)) {

			$address = \preg_replace($comment, "", $address);
		}

		return $address;
	}

	function get_address ($address)

	{
		$address = \preg_replace("/([ \t\r\n])+/", "", $address);

		$address = \preg_replace("/^.*<(.+)>.*$/", "\1", $address);

		return $address;
	}

	function smtp_debug ($message)

	{
		if ($this->debug) {

			echo $message;
		}
	}

}
